Lifting jack



Pt- 1933. F. H. S'GHWERIN 1,925,821

LIFTING JACK Filed Jan. 12, 1931- VENTOR 7 ATTORNEY Patented Sept. 5,1933 PATENT OFFICE LIFTING JACK I Frank H. Schwerin, Bellevue Borough,Pa., as-

signor to The Duff-Norton Manufacturing Company, Pittsburgh, Pa., acorporation of Pennsylvania Application January 12, 1931. 7 Serial No.508,127 10 Claims. (Cl. 28053) I This invention relates to heavy liftingjacks,

having wheels onto the rolling support of which the jack canbe tiltedfor trundling. These jacks have a firm base to rest on the ground, and astandard "risingfrom the base, in which standard the ram or liftingmember is guided;

Two wheels are applied to some lower part of thehousing at suchelevation that they normally clear the ground.

It requires a substantial amount of eifort to pull one of'these jacksover onto its. wheels,and

is rigidly braced by and'between the fixed parts of a socket. The handlethus mounted can be latched in the erect position, the latch not beingsubjected to the stresses but being merely a-retainer. I Another-objectis to provide a trundling handle of a type easy to grasp, which handlewhen swung down can be disposed as close as possible to the housing. IThe general purpose is to provide a light, compact, very strong and veryconvenient handle construction, which can be little 'expense. I

Other objects and features of the invention will be apparent to thoseskilled in the art a the specification proceeds.

In the accompanying drawing, forming part hereof: v

Fig. 1 is an elevation of a jack' embodying the broken lines; i v

Fig. 2 is a fragmentary sectional elevation lookportion of the handlebeing broken out;

Fig. 3 is a section taken on the line33 of Fig. 1; and

Fig. 4 is a section taken on the line 44 of Fig. 2; two extremepositions of the handle in respect to swiveling about its longitudinalaxis being shown in full and broken lines, respect l The housing of thejack has a base 2 and a standard 3/ In the latter'is guided the ram, thehead 4 of which is seen in Fig. 1. The lifthandle which is pivoted sothat it can be folded down out of the way' and which when erected madeeasily and at invention, the handle being shown in the folded conditionin full lines and in erect position in ing at right angles to Fig.1, anintermediate ing screw and the operating mechanism need not beillustrated since they form no part of the invention. The jack may beoperated by an air motor 5 applied to the lower part of the housing,though that is not material.

The two trundli ng wheels 6 are carried by axles '7 on suitable brackets8 of the lower por-' tion of the housing. It will be understood thatthese wheels are projected away from the base in what may be termed, forconvenience, a rearward direction, so that the jack can be tiltedonthe'edge of the base as on a fulcrum until the slightly elevatedwheels are brought into contact with the ground and the base is thenraised clear of the ground, after which the jack can be pushed along onthe wheels. Provisions of this character are disclosed in the Kopf &Schwerin Patent No. 1,329,665, dated February 3, 1920. y

The improved trun'dling' handle will now be described.

Bolted to the upper part of the standard, at

the region which may be termed the back, is a fixture 9, which mayincidentally cover an opening into the interior. This fixture is formedto provide an integral socket 10 comprising an inner cheek 11, an outercheek 12 and a side wall 13 uniting them, the whole preferablystrengthened-by a rib 14':

A pin'15 is held in openings in'the lower portions of the cheeks,extending across theintervening recess. On this pin' is pivoted one endof a handle stublfi. Because of the relationships, the axial projectionof the pin 15 is substantially at right angles to the vertical plane ofthe wheel axles 7, and the trundlingfhandle will accordingly swing in alateral arc. By this is meant that thehandle folds down atone side ofthe jack considered as a wheeling body. In Fig.1 it is shown incliningdownward in front of the left-hand wheel 6. v 1

The remaining, and major, part of the trundling handle consists of atubular shaft 1'7 hav shown in Fig. 4, where it will be seen that thesolid portions 21' at the zone of the slot will limit thepin 19, andtherefore the shaft 17, to

i The meaning of this term will be evident from the section is such thatwhen the handle is locked by the engagement of the bolt, the handle bars18 are disposed transversely with relation to the direction of travelrepresented by the planes of the wheels 6.

When the handle is erected the latch not only locks the shaft 17 withits handle bars 18 against swiveling about the. axis of the shaft,

that is to say about the stub 16, but, alsolocks.

the handle as a whole in the upright position.

Whenthe latch is. released the trundling handle canbe swung downalongside the housing, free of. the superstructure of the motor 5, ifthe jack is motor driven, and: also clearing the wheel at that side. i

If it were. not for the swivel inthe handle,

the end of one ofthe handle bars 18 would come into contactwith-somepart of the hous ing, causing the handle to stand far. out from thejack.. That wou1d=make=the cross-bar type:

of handle, which ismost advantageous, for. the

purpose of these jacks, impractical, and it isfor that reason that Ihave provided aswivel in the; handle, so that the handle bars. can beturned to lie close to the jack in the folded or dropped, condition. I.have. also provided alock to keepthe handle bars from swiveling when:the handle israised preparatory to moving the jack about, this being inaddition to the locking of the handle as awhole against swinging on thepivot 15. I

Whenthe handle is put up.v and locked, the operator grasps the bars 18.-with both hands and pulls towardhim; This uptilts thejackon its base andbrings the wheels to the ground,

and it will be Observed that, as between. the

handle and the jack, the stress of this effort is taken by the rigid'soc ket-10, the cheeks of which are, so to speak, at. right anglestothe plane of action. Thelatch. 22-. is not called on to resistthisstrain or for any other duty than.

to latch. or lock the handle, against. displacement. In like mannerallstresses duringtrund1ing,,and when. the jack is let. down again on itsbase, are taken directly between. the;handle and; thesocket. I V

While the preferred embodimentofthe invention has been described indetail. it will be understood that the form of the invention may bemodified-in various-particulars. V

I claim: A f

1., Inalifting jackhaving a base and housing comprising astandard, and apair of wheels ontothe rolling-support of which. the jack can be tilted;asocket fixedon the standard, said socket comprising.- outer and. inner.portions rig-idly united in spaced relation, a pivot pin crossing therecess between said portions in: substantially right angular relation tothe vertical 'planethrough, the. wheel axles, and' a trundling handlepivoted on said. pin so that it can be swung up and downina lateral.arc, and when erected is rigidly braced between the outer and innerportions of said socket. 1 i

2. In a lifting jack-.hav-inga base and housing comprising a standard,and a pair of wheels onto the rolling support of which the jack can betilted; a socket fixed on the standard, said socket comprising outer andinner portions rigidly united in spaced relation, a pivot pin crossingthe recess between said portions in substantially right-angular relationto the vertical plane through the wheelaxles, and'a trundling handlepivoted on said pin so that it can berswungup and down in a lateral arc,and when erected is rigidly braced between the outer and inner portionsof said socket, together with a latch in said socket adapted to hold thehandle erect without being subjected to the strain of handling the jack.

3. In aliftingjackhaving a housing comprising a base and a standard, anda pair of Wheels onto: the'rolling: support of which the jack can betilted; altrundling handle comprising a stub pivoted on the standard anda handle shaft swiveled. on: saidstub, and a latch; adapted to lock-thehandle in erect positionandat thesame' time-to lock the handle shaftagainst swiveling; about its axis.

la/In a lifting jack having; a housing com-- prising a. base andstandard, and. a pairof wheels onto. the rolling support of which thejack can be'tilted; a tr undling handle comprise ing a stub pivoted onthe standard-and. a. handle. shaft swiveled. on said stub, and providedwith cross-bar grips, and. means for. lockingv the handle erect and .thehandle shaft against. swiveling.

. 5. In a lifting jack having a. housing-compris ing abase and. astandard, anda. pair of wheels. ontothe rolling support of which thejack cani be. tilted; a. trundlin'g. handle comprising a part pivoted onthe standardto. swing intov a folded. position; through a, lateralfarc.substantially at: right angles to-the planes of rotation. of, the.wheels, and across-bar grippart swiveledonthepivoted part. 7 7

6. In a lifting jack having a housingcomprising a base and-.a. standard,and. apair ofwheels onto the rolling support of which the jack can. canbe tilted; atrundling handle oomprisinga part pivoted on. the standardto swing, into. a. folded. positionv through a lateral%. arcsubstantially at rightangles to the planes of rotation. of the wheels,a.cross-bar. grip part swiveledon the pivoted part,v and means forlocking both parts. I

7. In a lifting jack having a housing comprising a base and astandardand a pair of wheels onto the rollingsupport of which the jack can. be;tilted; a trundling handle comprising a stub pivoted. to the standardfor movement into a folded position, and provided with aquarter turnslot at right anglesto the longitudinal. axis of the stub, a tubular.handle shaft taking over the stub, anda cross-pin extending throughsaid. slot and connecting the handle to the stub-so that thehandle maybe oscillated through. a quarter turn with respect, to thestubp 8. In alifting jack having, a housing-comprising a base and a standard, and a.pair of wheels crossing the recessb'etween said cheeks, ahandle stubpivoted on said pin, a tubular cross-i barred shaft taking over saidstub between. said cheeks, a swivel connection betweensaid shaft andstub, and a latchon: said socket to. enter. a hole in'said shaft.

9. In a lifting jack having ahousing compris ing a base and a standard,and a pair of wheels onto the rolling support of which the jack can betilted; a rigid socket fixed to the standard and having inner and outercheeks, a pivot pin crossing the recess between said cheeks, a handlestub pivoted on said pin and formed with a quarter-turn slot, a tubularhandle shaft taking over said pin and formed with a quarter-turn slot, atubular handle shaft taking over said stub between said cheeks, across-pin in said shaft cooperating with said quarter-turn slot, and alatch on said socket to enter a hole in said shaft.

10. In a lifting jack having a base and housing comprising a standard,and a pair of wheels onto the rolling support of which the jack can betilted; a bearing on the upper part of the standard with the axis of thebearing in a plane parallel to the plane of rotation of the wheels, anda trundling handle journaled on the bearing, so that the handle can beswung from an erect position to a folded position through a lateral areat right angles to the plane of rotation of the Wheels, whereby theforce applied to the handle to tilt the jack will be transmitted throughthe bearing to the standard and will not tend to move the handle intofolded position.

FRANK H. SCHWERIN.

